Help with accurate numbers below

Simon recently recerved a credit card with a 21% nominal interest rate. With the card, he purchased an Apple iphone 7 for $382.35, The minimum pavment on the card is ordy $20 per month a. If simon makes the minimum monthly payment and makes no-other charges, how many months will it be belore he pays off the card? Do not round intermediate calculotions- Round your answer to the nearest whole number. monthis) b. If simon makes monthly paymente of s65. how many months win at be before be poys off the debt? Do not round intermediate calcuiations. Round your answer to the nearest whote-number mishthirs? answer to the nithist cent